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ip6tnl: less dev_put() calls
Using dev_get_by_index_rcu() in ip6_tnl_rcv_ctl() & ip6_tnl_xmit_ctl() avoids touching device refcount. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
654d1f8a01
commit
f1a28eab20
1 changed files with 5 additions and 6 deletions
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@ -658,6 +658,7 @@ static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t,
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IP6_ECN_set_ce(ipv6_hdr(skb));
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}
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/* called with rcu_read_lock() */
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static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
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{
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struct ip6_tnl_parm *p = &t->parms;
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@ -668,15 +669,13 @@ static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
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struct net_device *ldev = NULL;
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if (p->link)
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ldev = dev_get_by_index(net, p->link);
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ldev = dev_get_by_index_rcu(net, p->link);
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if ((ipv6_addr_is_multicast(&p->laddr) ||
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likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
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likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
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ret = 1;
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if (ldev)
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dev_put(ldev);
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}
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return ret;
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}
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@ -804,8 +803,9 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
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if (p->flags & IP6_TNL_F_CAP_XMIT) {
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struct net_device *ldev = NULL;
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rcu_read_lock();
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if (p->link)
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ldev = dev_get_by_index(net, p->link);
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ldev = dev_get_by_index_rcu(net, p->link);
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if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
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printk(KERN_WARNING
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@ -819,8 +819,7 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t)
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p->name);
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else
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ret = 1;
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if (ldev)
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dev_put(ldev);
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rcu_read_unlock();
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}
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return ret;
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}
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